What is in the sample
Blood contains DNA from different origins. ctDNA analysis searches for signals attributable to the tumour within that mixture. Quantity and detectability depend on the biological context and test characteristics.
What a result can establish
Detection of an alteration is an assay finding in the collected sample. Failure to detect it does not establish the absence of a tumour. Examine detection limits, material, collection time and the strategy used to identify the signal’s origin.
Connect the finding to the study objective
Treatment selection, monitoring and residual disease investigation are different uses. Each needs its own validation. Check whether a study only found an association or demonstrated an advantage from decisions based on the result.
Interpretation limits
ctDNA is not synonymous with definitive diagnosis or residual disease in every situation.
Original references
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Research questions
Select tools by method, population and purpose. A thematic connection does not validate use in every case.
Educational content for framing research. Consult the original document, study population and methodology before interpreting a conclusion. Methodology